Domain Mapping Plugins

Hey Guys

I am curious if there is any differences between the free Domain Mapping Plugin here: http://wordpress.org/plugins/wordpress-mu-domain-mapping/ and the premium one you guys offer here on the site?

If so, what are the differences? It looks like Automattic created the free one. I am going to start building client sites under a multisite environment using Domain Mapping and I haven't tried it yet.

Also, if I went with the premium one on this site, do I have to still follow instructions for sunrise files etc even if I click the Auto "install" button from within Wordpress dashboard? Thanks for any help you can provide!

PS. The forums keep editing my post title to something ridiculous. I have to go in and edit post title each time I publish a question.